K-Doped Co–Mn–Al Mixed Oxide Catalyst for N2O Abatement from Nitric Acid Plant Waste Gases: Pilot Plant Studies
2016
Pacultová, K. | Karásková, K. | Kovanda, F. | Jirátová, K. | Šrámek, J. | Kustrowski, P. | Kotarba, A. | Chromčáková, Ž | Koçi, K. | Obalová, L.
The K-doped Co–Mn–Al mixed oxide deN₂O catalyst was prepared by calcination of Co–Mn–Al layered double hydroxide, subsequent impregnation with KNO₃, and shaping into tablets of 5 mm × 5 mm. Tablets were tested for N₂O decomposition in pilot scale reactor connected at the bypassed tail gas from the nitric production plant downstream of the SCR NOₓ/NH₃ catalyst with the aim to perform kinetic measurements. Special attention was paid to study the changes in the catalytic performance, which was monitored using both the long-term catalytic test and the comparison of physical–chemical properties of the fresh and used catalyst. The changes in the surface composition, caused by the time-on-stream operation for 112 days in the pilot reactor, provided stable catalytic performance; average value of N₂O conversion of 90 ± 6% at 450 °C was kept (GHSV = 11 000 m³ mbₑd–³ h–¹). The obtained kinetic data were applied in modeling of a full-scale reactor for the N₂O emissions abatement and can be used for estimation of the amount of the catalyst necessary for obtaining required N₂O conversion in the target plant.
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